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November 24 2014
ESB 3 - 27
Evolution
Diversity of life
1.5 million described species (not necissarily the number alive now)
Mostly plants and insects
.5 million insects
.35 million beetles
.4 million plants
4000 mammal species
3 - 30 million species currently living on Earth
Darwin went on a 5 year voyage
Galapogos islands
12 kinds of finch, specific to single islands.
Two species that have exactly the same requirements cannot coexist
in the same habitat
A niche represents the set of enviromental conditions under which a
population
of individuals of a given species can persist.
Fundamental and Realized niches
if A can exist in niche |AAAAAAAAAA |
and B can exist in niche | BBBBBBBBBB |
The realized niche is |AAAAAAAABBBBBBBB |
Insects are super successful because:
Often, larvea and adults do not compete for resources
Complex social structure / colonies
...
NAtural Section
1) Inheritance of traits from previous generation
2) Variation in those traits
3) Survival and reproductive success rates that vary with the
enviroment
After extinction events, a period of rapid evolution tends to occur
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